rjehangir
commented
10 years ago Hi Walt,
Thanks so much for looking over the schematic. I really appreciate it. I'm not an electrical engineer so I can use all the help I can get!
I actually discovered this problem myself during one of our first tests. The FETs got so hot that they desoldered themselves. I've since replaced the high-side with P-channel FETs on that prototype and revised the schematic for N-channel on the high side. I added a very basic charge pump with diode and capacitor, as you see on most N-channel ESCs. I just pushed those changes and I'd be really grateful if you could glance at it again and let me know what you think.
Also, what do you think about FET drivers? They are typically used for ESCs over 30-40 amps and should improve efficiency and heating a bit. This ESC will max out around 30 amps but it still may be a good addition. I've been looking at IR2101 specifically.
Best,
Rusty
On Mon, Sep 1, 2014 at 11:06 PM, WaltHolm notifications@github.com wrote:
Hi Rusty:
I took a peek at the design you used for the Rev1 version of the BlueESC. The driver configuration you are using seems to be for a P-channel high-side switch, yet the schematic shows a N-channel high-side switch. I can't see how you're going to get a fully-enhanced high-side transistor with this configuration, leading to poor efficiency and overheating of the high-side transistor.
-Walt Holm
— Reply to this email directly or view it on GitHub https://github.com/bluerobotics/BlueESC/issues/1.
Hi Rusty:
I took a peek at the design you used for the Rev1 version of the BlueESC. The driver configuration you are using seems to be for a P-channel high-side switch, yet the schematic shows a N-channel high-side switch. I can't see how you're going to get a fully-enhanced high-side transistor with this configuration, leading to poor efficiency and overheating of the high-side transistor.
-Walt Holm